A rectangular concrete footing is under a service dead load of $300$ kN and a service live load of $200$ kN $.$ The allowable soil bearing pressure for the foundation is $240$ kPa $,$ thus the required area of footing is at least

$\backslash$table$[[2\mathrm{.}08$ m $2],[2\mathrm{.}75$ m $2],[1\mathrm{.}69$ m $2],[1\mathrm{.}83m2$